Well, of course, the answer is La Baguette Bistro on N. May Ave, about 20 mins from OKC airport
http://www.labaguettebistro.com/
....of course, I'm biased, since step-son is chef there....it's locally owned
....but it's open only until 2:30pm on Sundays (fantastic brunch crowd)..... let me know if there's any particular type or taste you have in mind, and I'm happy to give recommendations for my home town.....
....also browse the restaurant listings/reviews from the local semi-counterculture weekly paper....
http://www.okgazette.com/oklahoma/
enjoy! (sorry if this is too late for Sun May 12)